N.H.
When I was moving my tropical fish after my divorce and from one apartment to another, I always used one of those battery operated minnow pumps. I took a big jar, like a Nonni's Biscotti jar and punched a hole through the top, just big enough for the airline. Then hooked up the pump to that line. Worked fine for all but my very large plestococus sp???? He was huge and probably needed more air. All the other 9 fish made it OK.
Grandma N.